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  Thereissupposedtobeasafety______whichmakesitimpossiblefortrainstocollide.A)applianceB)accessoryC)machineD)mechanismA和D有什么区别

  Thereissupposedtobeasafety______whichmakesitimpossiblefortrainstocollide.A)appliance

  B)accessory

  C)machine

  D)mechanism

  A和D有什么区别

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2019-05-0113:48
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吕永健

  应该选D.safetymechanism安全机制,而appliance是设备的意思,不合句意.

2019-05-01 13:53:31
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